MPLS Transport Encapsulation for the Service Function Chaining (SFC) Network Service Header (NSH), June 2019
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This document describes how to use a Service Function Forwarder (SFF) Label (similar to a pseudowire label or VPN label) to indicate the presence of a Service Function Chaining (SFC) Network Service Header (NSH) between an MPLS label stack and the packet original packet/ frame. This allows SFC packets using the NSH to be forwarded between SFFs over an MPLS network, and to select one of multiple SFFs in the destination MPLS node.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 4844.